B1A4 member CNU showed just how much he loves his older sister when he got emotional while singing at her wedding.

The five-member group recently performed “With You” (their remake of The Blue’s track which was included on the “Reply 1994” soundtrack) at CNU’s older sister’s wedding. In a video of the performance, CNU surprises the other guys when he gets choked up while he’s singing and has to stop.

CNU turns away from the crowd to hide his tears and Baro laughs and gives him a big hug. When he turns around, Baro is wiping his own tears as well!

Check out the video below.

B1A4 is currently promoting their title track “A Lie” off their third full album “Good Timing,” and recently took home their second trophy for the song on last week’s episode of “Music Bank.”