On November 10, tripleS's sub-unit AAA (Acid Angel from Asia) were guests on the popular radio show ‘Idol Radio.’

The girls did a lot of fun covers, including (G)I-DLE's ‘Nxde’ & Oh My Girl’s ‘Remember Me,’ as well as a fun, quick photo shoot for fans.

Later on, during the interview portion of the radio broadcast, Nakyoung brought up her sister, soloist BIBI, and how she was trying to prepare her to be an idol as she is already one. She stated that she missed her as they both had busy schedules, but was soon surprised to hear from host Seunghee that they had a special call for her.

BIBI hopped on the line for a short minute to congratulate her sister again for her debut and to tell her how proud she was. She reminded her to take care of her health and to make sure she eats daily. This phone call made Nakyoung very emotional, and she shed tears. Watch the heartwarming moment below.