The similarities between One Spring Night/Something In the Rain and The Hagwon

The house that MLs parents live in is the same as FL's house in SITR

The place where the directors met for tea in ep4, its the same place in OSN where FLs family (minus her dad) meet with the ML and have a meal together.

In OSN the FL has 3 sisters, here the ML has 3 brothers - they are not shown though, but can count it as a fun fact :)