A Gentleman's Dignity
신사의 품격 (original)
Four men with complicated love lives refuse to admit they're getting older, and attempt to prove that forty is the new thirty!
Starring Jang Dong-gun, Kim Ha-neul, Kim Su-ro, Kim Min-jong, Lee Jong-hyun, Yoon Se-ah, Kim Jung-nan, Yoon Jin-yi, Lee Jong-hyuk, Kim Woo-bin
Watch "A Gentleman's Dignity" on Rakuten Viki released in 2012. It's a drama and comedy show, and has a rating of 8 out of 10 from Imdb which is usually fine for this kind of show, and is currently available to watch for free.