Her Smile So Sweet (2020)

Both are dramas with a school setting in which the main couple are deskmates and the ML helps the FL study.

Both are dramas set in school with one of the leads an introvert and the other a more popular study. Both MLs are very smart and help the FL study.

Both are shorter length youth dramas set in school with a nostalgic feel and the FL reflecting on the past.

Both are dramas with a school setting and a nostalgic feeling, with the older FL reflecting on the past. The main couple are close friends throughout the drama, parting near the end, then get together romantically in the final scene.

Both dramas are set in school and have a very similar feel, tone, and slower pacing. Both MLs are very smart and tutor the FL who is bad at math. The couple drifts apart towards the ending, before finally getting together.

Her smile so sweet has an cold female lead, in love revolution there is an cold female lead too. Both the dramas have youth and school involved, and most importantly they have romance too, this is why I think they are similar. Hope my comment helped you.

Both are short dramas with a school setting.
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Both are short dramas with a school setting.
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Both are dramas with a school setting in which the main couple are deskmates and the ML helps the FL study. Both have the same plot point of the ML disappearing on the FL until they meet years later as adults.

Both shows show devloping relationship of two deskmates. Both are at odds at first but then slowly able to understand kind and helpful side behind cold exterior(of male lead). Female lead is smart and male lead is more like fun loving person. Separated for years then reunite again.