Perhaps It's Destiny (Completed)
KDramas that totally fits number 3 on this list: https://mydramalist.com/article/4-things-that-ruin-a-romantic-k-drama-011014925
"Hey, aren't you the boy who let me borrow a pencil when we were five"
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1. Imperatriz Ki
Korean Drama - 2013, 51 episodes
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2. Chocolate
Korean Drama - 2019, 16 episodes
Didn't mind the cliche trope here because I looveee this drama.