So, if you're asking what I expected, this is what I thought would happen: the moment Tae-jeong entered the house, he already knew that the person there wasn't actually Dong-jin but someone impersonating him. To avoid raising suspicion, he pretended to believe that he was the real Dong-jin while secretly investigating him. I also thought he was there to investigate Dong-hwa because, in an earlier episode, we saw Seo I-do being sent to kill him. That made me think Dong-hwa was involved in some kind of political scheme or larger conspiracy as well.
all the series episodes of secret of us ends like that
From what I can tell, it's a production company that has been focusing on short BL productions since last year. They've released several well-made projects, and they also have a channel called Secret of Us.