I think the new character is fun... he's not truly a threat to their relationship... but... Kang already some inner thoughts about how old he was compared to YiYoung. It's clear by his comment that YiYoung would day different people as he aged. It was a thoughtless remark, but one they need to talk about. This new character will stir things, but I don't expect anything to happen bad at all, this is a fluffy story.
I think the new character is fun... he's not truly a threat to their relationship... but... Kang already some inner thoughts about how old he was compared to YiYoung. It's clear by his comment that YiYoung would day different people as he aged. It was a thoughtless remark, but one they need to talk about. This new character will stir things, but I don't expect anything to happen bad at all, this is a fluffy story.