This story did a real good job with portraying what losing a child and reuniting with them after so long would actually look like. There was a lot of grief, guilt and anger from both the parents and Rubien. It wasn't a happy reunion/realization you see in other stories. The parents had a hard time accepting it because that meant that for 10 years they were mourning, their daughter was trained/used as a child soldier away from loving parents. Rubien had to endure all those years with no parents and go thru war as a child. 

like the title, Rubien had a lot of secrets and this was the last to be found out. First, that she is a girl, then that she was a mage, then that she was a child soldier that was being chased, and THEN that she was the lost child.
After finding out how hard life was for her the whole family was heartbroken, but then finding out she was kidnapped and your own child? Both parents lost it, and kept thinking if only had gone looking for her.

Things get real heated and they fight really intensly (like seojoon starts breaking stuff and joo an starts bleeding) 
Seojoon blows up says everything bothering him like how he felt like a rebound and that his feelings are getting trampled on. 

Joo an clarifies that he is over the other dude and is only thinking about Seojoon. They then get intimate (not all the way just get each other off) Then after that they realize things are somewhat mutually but joo an gets ho*** whenever seojoon is around so he avoids him, but seojoon takes it as Joo an hated getting intimate and regrets it (poor baby)
That was the latest chaper that came out today and was ch.91 so we are almost caught up with the raws!