Monstar

We have already seen that there is a history between Yoon Sul Chan and Min Se Yi, Yoon Sul Chan and Jung Sun Woo, the person we currently know as "Adam" and Min Se Yi, and (last but not least) "Radio" and Cha Do-Nam. Now, in this episode, we have also confirmed that there is definitely something between Yoon Suk Chan and his mother that has yet to be revealed.