To My Shore

On story:
- Both tried to follow the book to a T.
- Both have red/black flags and toxic relationships.
- Both have NC scenes

On leads:
- Both also have a very understanding other half.
- Both understanding other half are not pushovers and can stand their ground

There aren't any plot similarities between the two dramas, but if you like the obsessive and yearning ML paired with the calmer and more level headed ML dynamic, you will love both BLs. Both dramas are masterpieces, but Secret Lover won't give you nearly as much trauma as To My Shore lol.