Read all of the available chapters in one sitting. In Seob better have a good reason for the revenge thing other than guilt for not believing his friend, Jennie, and having feelings on his friend's crush. Actor guy is definitely psycho but (imo) In Seob is really just deluding himself into thinking that the actor was a bad guy (which he is but not to In Seob... or Jennie for that matter.)
I read this despite knowing it's incest because of the positive reviews. Now I'm sad. I feel so heartbroken for the father. He held out hope for 20+ years only to find out that Ryou is actually his biological son :(