On March 21, 2026, Fantagio marked ASTRO’s youngest member Yoon San-ha’s birthday with a celebratory post on its official Instagram, immediately catching fans’ attention with a heartfelt message.
In the photo, Yoon San-ha stands against red curtains in a black leather jacket, holding tulips in various colors. The phrase "Happy Birthday Yoon San-ha" made his special day shine even brighter.
Fans flooded the comments with messages like "FELIZ CUMPLEAÑOS TE AMOOOOOO", "Happy Birthday a nuestro amado maknae", and "산하お誕生日おめでとう", passionately celebrating Yoon San-ha.