Tokyo in April Is...

Both are JBLs with the leads having a connection from the time they were young (middle school in Tokyo in April Is… and university in Business as Usual) and then reconnecting as colleagues later in life.
Also in both the couple struggles to communicate openly and actively works on overcoming their problems to be together.

Japanese Latin dance champion Suzuki Shinya and Japanese standard dance champion Sugiki Shinya are both famous dancers. Although they are in different fields, their names differ by only one letter. Suzuki, who hates to lose, is irritated by being compared to the other dancer. One day, Sugiki suddenly invites Suzuki to "aim to be champion together in 10 Dances." 10 Dances is a competitive dance where dancers who have mastered both Latin and standard dance compete in a total of 10 dances. Suzuki initially refuses Sugiki's proposal to teach each other and aim for the top because it seems too reckless. However, he is overwhelmed by Sugiki's provocative and competitive attitude and accepts in anger. The two are polar opposites in terms of personality and everything and they clash, but as they take lessons every day, they work hard together and gradually close the gap. Then, Suzuki gradually realizes that he is starting to be attracted to Sugiki.

Both series are Japanese BL dramas where the main characters already fell in love in high school but were separated and met again as working adults, finding out that they still may have had feelings for each other. Both have a serious tone.

both have tensions and struggles between the MLs and the overall feel is similar.

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Love stories connecting with traumatizing past. It potrays the love between two people who overcomes all the traumatizing events to be togather.