One Fine Day (2006)

they have a similar vibe, similar story line. both can be kinda depressing at times.

If you liked one you'll like the other. Both center around the theme of forbidden love between siblings. In both stories they are adopted and brought into the same household in their youth, then torn apart only to reunite much later in their adult lives.

Female leads believe they are siblings with the male leads. Male leads secretly know they're not really related and fall for them romantically. Female leads eventually reciprocate their feelings.