Rated M-18 for Mature Content - Park Hyerim (Son Naeun) wakes up on the morning of 15th February naked with a hangover in a hotel room she had never seen before. She could not recall anything, other than the fact that she had went to a club last night feeling bitter and vengeful after being dumped by her ex-boyfriend - on Valentine’s Day, no less. She doesn’t remember how she ended up in the hotel, or who she slept with. All the mysterious guy left was a note, with only three words written on it - I love you
Dumbfounded, she sets off to find out just who this guy is. How did she meet him? Why did he leave before she woke up? What’s with the mysterious and slightly-stalkerish note? And most importantly, what happened last night?