"Happy 40th birthday to the one and only Yoo Yeon-seok! It's hard to believe that our favorite heartthrob has turned the big 4-0 today. But let's be real, age is just a number and you are looking as dashing as ever. Here's to another year of stealing our hearts on screen and making us swoon with your talented performances. May this special milestone be filled with love, laughter, and lots of cake. Cheers to 40 and fabulous, Yoo Yeon-seok!"