B1A4's CNU talked about how he got emotional at his older sister's wedding.

On the December 22nd airing of 'Kim Shin Young's Hope Song at Noon', CNU said, "My noona recently got married. All the members came together and sang a congratulatory song. I just got teary when I stood in front of my sister." 

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CNU continued, "We sang 'With You'. I was in charge of the bridge, but I just burst out in tears. I was going to turn my back and cry, but I made eye contact with the officiant so I just ended up greeting him [with a bow]."

The video of the touchy moment of CNU at his sister's wedding also went viral. Watch the touching moment here.