Baek Giho was fat, quiet, and even his name reminded people of “Baek Kilo” (100 kg). Because he was an easy target, he suffered severe bullying during his school days and ended up dropping out. After that, he changed his horrible name and lost so much weight that he became unrecognizable.

Then, his dreadful first love, Cheon Bokyung, approached him without realizing who he was.
“What should I do… Bokyung hates me…”
Giho (now Heeseong) doesn’t want his dark past to be exposed, so he continues his relationship with Bokyung without revealing his true identity…