diff --git a/store/workspace_setting.go b/store/workspace_setting.go
index a3cddbac..ddd52f0f 100644
--- a/store/workspace_setting.go
+++ b/store/workspace_setting.go
@@ -140,6 +140,7 @@ func (s *Store) GetWorkspaceGeneralSetting(ctx context.Context) (*storepb.Worksp
 const (
 	// DefaultContentLengthLimit is the default limit of content length in bytes. 8KB.
 	DefaultContentLengthLimit = 8 * 1024
+	DefaultReaction           = "👍"
 )
 
 func (s *Store) GetWorkspaceMemoRelatedSetting(ctx context.Context) (*storepb.WorkspaceMemoRelatedSetting, error) {
@@ -157,6 +158,9 @@ func (s *Store) GetWorkspaceMemoRelatedSetting(ctx context.Context) (*storepb.Wo
 	if workspaceMemoRelatedSetting.ContentLengthLimit < DefaultContentLengthLimit {
 		workspaceMemoRelatedSetting.ContentLengthLimit = DefaultContentLengthLimit
 	}
+	if len(workspaceMemoRelatedSetting.Reactions) == 0 {
+		workspaceMemoRelatedSetting.Reactions = append(workspaceMemoRelatedSetting.Reactions, DefaultReaction)
+	}
 	s.workspaceSettingCache.Store(storepb.WorkspaceSettingKey_MEMO_RELATED.String(), &storepb.WorkspaceSetting{
 		Key:   storepb.WorkspaceSettingKey_MEMO_RELATED,
 		Value: &storepb.WorkspaceSetting_MemoRelatedSetting{MemoRelatedSetting: workspaceMemoRelatedSetting},