Answer
Yes, Moon Seon-min has ever taken part in the AFC Champions League. He played for South Korean club Suwon Samsung Bluewings in the 2014 AFC Champions League and the 2016 AFC Champions League. In the 2014 AFC Champions League, he played in 6 matches and scored 0 goals. In the 2016 AFC Champions League, he played in 6 matches and scored 1 goal.