Recommendations

Both ML and FL suffer/have suffered loss or trauma. Both heal and slowly move forward with each others' help. The tone was similar in many ways.

The same events and time period, but one is a drama and the other a documentary. Both are very difficult to watch, but important and moving.

Similar love triangle. Many misunderstandings between the main couple.

Also in part 2 of the first season of Unique Lady, the FL agrees to go away with the SML, just like in ATWIL, but ends up returning to the ML after discovering he was wounded protecting her.

If you enjoy watching a bl with dark themes such as violence and suspense, then you would enjoy these two! Must watch bl's if that's your cup of tea.

Same actor as ML. Similar historical setting, tone, and relationship between the main couple.
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The story about a young man who can see spirits but he’s scared of the living & he figures out it has to do with his ex love

ML has powers (shaman/sees ghosts vs. nine tailed fox) and FL is human. The couple had past lives and FL or both have now reincarnated and reunited in the present. Both couples must work to stop the powerful, supernatural villain from their past.

The overall tone of My Secret Love seems to match that of the BL storyline in Kiss Me Again (the prequel to the Dark Blue Kiss BL). In addition, they are both Enemies-To-Lovers college dramas involving a more studious lead.

Enemies-to-Lovers involving the school's lead hazer/pranker. SOTUS is the blueprint for this plot that My Secret Love appears to make allusions to.

A quirky FL from the present day ends up in the body of a different girl in the past and has to live her life (dealing with a fiancée, etc.). Both have a fluffy, fun feel with a few serious moments.

Both involve groups of people trapped in a building fighting off supernatural monsters.

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(Won’t let me submit unless there are 100 characters so adding this inconsequential footnote).

ML in both dramas have to reconsider dating FL because of a past involvement with a family member and other tragic circumstances around it.

Under the Skin and Medical Examiner Dr. Qin are crime dramas with a ML who is a specialist in their field. The main characters of both share some nice bromance and friendship throughout their case solving.

Ugly alert follows a story of two families being combined by the marriage of their parents a wife who as a daughter and a son and husband who has a son and later had a daughter together. Don’t wanna spoil to much but tragic events happen and both parents pass leaving the son of the man to take care of his three younger siblings which latter result into them hating him both dramas are heart warming family dramas although it’s a lot of ep it’s worth the watch

It is a similar topic - the gay relationship of an older and a younger guy, and it also stars Rex Lantano.