sorry if this is not the right place honestly idk where to ask, please let me know.

can someone tell me what happens to  the kid from ep 3-5? im not sure but i think he was duk gu (janggeum's adoptive father)and his wife's son? they dont mention him again except a few times and after that completely he is barely mentioned (?) even though her adoptive parents have a lot of scenes later on too. i thought of him at like ep 47  lol and wondering where he went, cuz i thought he would be potential male lead as well but seems not, im just really curious what the heck happened to him because i started skipping some scenes and might have missed it