'Player' releases main teaser filled with hardcore action starring Song Seung Hun, Krystal, Lee Si Un, & more

Song Seung Hun, Krystal, Lee Si Un, & Tae Won Suk take you behind the scenes at 'Player' drama script reading

Song Seung Hun, Krystal, Lee Si Un, & Tae Won Suk make one bad team in first 'Player' drama teaser

Daniel Henney gives Lee Si Un a tour of the 'Criminal Minds' set

Lee Si Un thanks F.T. Island's Hongki for a coffee cart sent to the filming set of 'Live'

Lee Si Un says his girlfriend Seo Ji Seung is pretty and kind

Actor Lee Si Un dating actress Seo Ji Seung, who is 6 years his junior!

Actor Lee Si Un talks about attending Taeyang and Min Hyo Rin's wedding and after-party

Lee Si Un reveals he will be giving away his spot on 'I Live Alone' to 'Lee Bo Yeon' starting next week

Henry, Lee Si Un, and webtoon artist Kian84 spent time bonding on 'I Live Alone'

Close friends Joo Young and Lee Si Un support CNU for B1A4's comeback but with a cute mistake

Mad Town's Jota, Shim Hyung Tak, Yoon Hyung Bin, and more confirmed for next season of 'Real Men'