Minyoung's mad obsession with Cheol is one thing, but now because of this carefully planned reunion they've had and an ever ecstatic one night stand, I think what we're witnessing is Cheol developing his own possessive streak towards Minyoung, much to the latter's pleasure and satisfaction.
I believe a good ol' beat 'im to a pulp is in order. That blonde sleaze better be counting his days, if he has any left at all. Next chapter gonna be tea.