The actor took on a role of a guy friend who's been having a crush on an extremely lucky girl for 3 years. He's so caring that he goes to pick her up and even takes her home after receiving drunk texts (yeah, drunk texts. She obviously likes him too).
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At the end, he makes the move and confesses his love for her. Happy ending and major shim koong. Go ahead, and treat yourself with Park Bo Gum's sweetness.