diff --git a/README.md b/README.md
index 899ae48..d642959 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,8 @@ Join link: [Google meet](https://meet.google.com/jyx-mxnq-kpk)
 
 ## 2026 1Q meetup list
 
-- [278th, 2026-03-14](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531), will be open
+- [279th, 2026-03-21](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/533), will be open
+- [278th, 2026-03-14](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531), joined 3
 - [277th, 2026-03-07](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530), joined 5
 - [276th, 2026-02-28](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528), joined 2
 - [275th, 2026-02-21](https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527), joined 2
@@ -493,20 +494,21 @@ and participate more than 30 online meetup, get the chicken gifticon.
 
 |Ranking|Name|Count|
 |-------|----|-----|
-|1|[Kim Jong Feel](https://github.com/jongfeel/)|10|
-|2|[최지윤](https://github.com/chichoon/)|10|
+|1|[Kim Jong Feel](https://github.com/jongfeel/)|11|
+|2|[최지윤](https://github.com/chichoon/)|11|
 |3|[Yeshin Lee](https://github.com/yeslee-v/)|6|
 |4|[LeeDaYeon](https://github.com/ErigoLee/)|5|
 |5|[TaeWon](https://github.com/ytw9699/)|4|
 |6|[Daewon Paeng](https://github.com/fora22/)|1|
 |7|[ARi](https://github.com/hyunhyee/)|1|
+|8|[Harry Ho](https://github.com/hemil0102/)|1|
 
 ### All from first to present
 
 |Ranking|Name|Count|
 |-------|----|-----|
-|1|[jongfeel](https://github.com/jongfeel/)|271|
-|2|[최지윤](https://github.com/chichoon)|180|
+|1|[jongfeel](https://github.com/jongfeel/)|272|
+|2|[최지윤](https://github.com/chichoon)|181|
 |3|[yeslee-v](https://github.com/yeslee-v/)|109|
 |4|[Jeongan Lee](https://github.com/fkdl0048/)|51|
 |5|[TaeWon](https://github.com/ytw9699/)|48|
@@ -555,6 +557,7 @@ and participate more than 30 online meetup, get the chicken gifticon.
 |48|[cyhcyh100](https://github.com/cyhcyh100/)|1|
 |49|[3Cat-jaguar](https://github.com/3Cat-jaguar)|1|
 |50|[KyungDong Yoo](https://github.com/yugd1211/)|1|
+|51|[Harry Ho](https://github.com/hemil0102/)|1|
 
 ### Ranking history
 
diff --git a/Stamp/README.md b/Stamp/README.md
index 5950c07..5be7d02 100644
--- a/Stamp/README.md
+++ b/Stamp/README.md
@@ -26,8 +26,9 @@
 
 | Name | 01-03 (268th) | 01-10 (269th) | 01-17 (270th) | 01-24 (271th) | 01-31 (272th) | 02-07 (273th) | 02-14 (274th) | 02-21 (275th) | 02-28 (276th) | 03-07 (277th) | 03-14 (278th) | 03-21 (279th) | 03-28 (280th) |
 |-|-|-|-|-|-|-|-|-|-|-|-|-|-|
-| [Kim Jong Feel](https://github.com/jongfeel/) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706592905"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3731404198"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3762491965"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793377941"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827142452"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863335319"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900442926"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937918033"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3976025335"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015188160"><img src="approved_1Q.png"/></a> | 
-| [최지윤](https://github.com/chichoon) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706579591"><img src="approved_1Q.png"/>book 16/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3726416555"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 17/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3748315626"><img src="approved_1Q.png"/>book 18/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793340101"><img src="approved_1Q.png"/>book 19/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3802717566"><img src="approved_1Q.png"/>book 20/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863284869"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/><img src="approved_1Q.png"/>book 1/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900425233"><img src="approved_1Q.png"/>book 2/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937871053"><img src="approved_1Q.png"/><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 3/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3948929982"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 4/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015429862"><img src="approved_1Q.png"/>book 5/20</a> |  
+| [Kim Jong Feel](https://github.com/jongfeel/) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706592905"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3731404198"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3762491965"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793377941"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827142452"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863335319"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900442926"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937918033"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3976025335"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015188160"><img src="approved_1Q.png"/></a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059108870"><img src="approved_1Q.png"/></a> | 
+| [최지윤](https://github.com/chichoon) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706579591"><img src="approved_1Q.png"/>book 16/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/515#issuecomment-3726416555"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 17/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/517#issuecomment-3748315626"><img src="approved_1Q.png"/>book 18/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793340101"><img src="approved_1Q.png"/>book 19/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3802717566"><img src="approved_1Q.png"/>book 20/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/524#issuecomment-3863284869"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/><img src="approved_1Q.png"/>book 1/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900425233"><img src="approved_1Q.png"/>book 2/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/527#issuecomment-3937871053"><img src="approved_1Q.png"/><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 3/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/528#issuecomment-3948929982"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 4/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015429862"><img src="approved_1Q.png"/>book 5/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059105742"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/><img src="approved_1Q.png"/>book 6/20</a> | 
+| [Harry Ho](https://github.com/hemil0102/) | | | | | | | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/531#issuecomment-4059113118"><img src="approved_1Q.png"/><img src="approved_1Q.png"/>book 1/20</a> | 
 | [LeeDaYeon](https://github.com/ErigoLee/) | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/514#issuecomment-3706578972"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 3/20</a> | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793343060"><img src="approved_1Q.png"/>book 4/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827095902"><img src="approved_1Q.png"/>book 5/20</a> | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/525#issuecomment-3900394490"><img src="approved_1Q.png"/>book 6/20</a> | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015090784"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 7/20</a> |
 | [TaeWon](https://github.com/ytw9699/) | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/518#issuecomment-3793606675"><img src="approved_1Q.png"/>book 15/20</a> | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/519#issuecomment-3827006937"><img src="approved_1Q.png"/>book 16/20</a> | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015148739"><img src="approved_1Q.png"/><img src="Starbucks_americano.JPG"/>book 17/20</a> | 
 | [ARi](https://github.com/hyunhyee/) | | | | | | | | | | <a href="https://github.com/ThinkAboutSoftware/OnlineSelfCodingGroup/issues/530#issuecomment-4015211318"><img src="approved_1Q.png"/>book 2/20</a> |