Its quite rare for K-Pop idols to get kicked out of their respective group but it has happened. If it is a female fan dating a male idol then nothing happens to the male idol but the female fan becomes the public enemy of his entire fan base and be bombarded with hate mail death threats. Not because the people in the group want that but because the fans get upset.
Apparently this person isnt Korean -just followed the groups activities got to approach this bias of mine had a lil introduction here and there and they hit it off.
Some trainees can get kicked out if they are found dating. Its quite rare for K-Pop idols to get kicked out of their respective group but it has happened. JYP Entertainment has a dating ban on their idols. Not because the people in the group want that but because the fans get upset.