Actors Jo In Sung, Lee Kwang Soo, and EXO's D.O revealed their close relationship.

"1 year anniversary of It's Okay, It's Love. Jang Jae Yeol, Park Soo Kwang, Han Kang Woo celebration," posted Lee on his Instagram on Thursday along with pictures.

In the picture, Jo, Lee, and D.O are posing for the camera together with a cake lit in front of them. They seem to have remained close even though it's been a year.

Jo, Lee, and D.O had appeared in the SBS drama "It's Okay, It's Love" together last year.