well it was subtly discussed during the scene were Peem was asking Q about kissing since he has been in a few relationships already. if i remember it was on ep6.
but I know this info since I read the novel although I have not finished it yet.
Err so who's the older brotherFang or Phum?1. So they waited till the 3rd part of episode 12 to spring a family…
they are 3 brothers, if you noticed during the lunch scene, the mother was asking Fang how his brother is and Fang replied that his brother will take time to come back. so Fang is the middle child while Phum is the youngest of the 3 brothers.
but I know this info since I read the novel although I have not finished it yet.