Ji Yeon is in a long term relationship with her boyfriend. However, their fluffy love turns around when she meets another man.
Gradually as she starts to know him, she grew attracted and curious, swaying from her boyfriend.
Her boyfriend finally popped the question about marriage, making her feel guilty.
The other man doesn't want to let go of her but nor does her boyfriend know about it.
What will she do?
Guilty pleasure that wasn't intentional became dangerous and heart breaking.
Who will she choose?
Will she be able to save her potential marriage, heart, and herself from pain?