Both male leads are famous and took the initiative to approach the female leads first. Both of them made it clear that they only love the female lead from the start. Both dramas started from them knowing each other online as well.

Adapted from novels of the same author. Both female leads are a fan of the male lead and somehow got to meet the male lead and fall in love. Both fls are also college students who fell in love with older famous male lead. Both male leads are the greenest flag as well and they both have very supportive friends.

Both set in 90s, slice of life and focused on friendship, love, dreams, and family. The trope is similar as well (friends to lovers or enemy to friends to lovers). Especially, both female leads liked the second male lead first before falling for the male leads.

Both dramas have multiple main characters with superpower and they tried to fight from being used by bad people. The school setting is also similar as students with special abilities are treated better than the normal ones.

SFOT is about time travel, and ExY is about characters in novel, but both give off the same vibes. The female lead once liked the second male lead, but when she came to realization, she becomes interested in the male lead instead. Also, when the time changed, they put the same sound effect too.

The two dramas played around the timeline very well. Both are revolving around the time loop but Someday or one day focused more on romance while Reset focused more on the accident. Both male leads are attractive and cute.

Both dramas are about friendship, neighborhood, and life in the late 80s and 90s. They include the relationship between parents and children, siblings. Both are fun to watch, but can also make you cry.

The female lead from IOTNBO and the male lead from FOE both have antisocial personality disorder because of their parents.