40 years old (Born on April 21, 1985)
Happy Birthday, Lee Tae-sung! From charming us as the lovable Yong Tae-moo in "Rooftop Prince" to stealing hearts in "Hooray for Love," you've proven your talent is timeless—just like our endless rewatch marathons. Whether you're making us laugh, cry, or cheer you on as Kim Jae-gu in "Gangster High," your performances always hit the mark.Here's hoping your birthday is filled with more joy than a rooftop reunion and fewer complications than a gangster high school drama. Keep dazzling audiences and inspiring smiles; after all, you're not just aging gracefully—you're leveling up! Cheers to another fantastic year ahead!