Lover Merman

same:
- both are BL
- both are about merman

difference:
- Sereno's overall mood is a bit darker than Lover Merman
- Sereno is Filipino, while Lover Merman is Thai

Both Dramas about male mermaids aka Merman (mermen). 49 Days was a bromance but Lover Merman is an actual BL.

49 Days with a Merman is a Taiwanese production.
Lover Merman is a Thailand production.

Both are LGBT dramas with male mermaids (aka mermen) involving “romance”.

Lover Merman is from Thailand whereas Mermaid’s Jade is from China.

Keeper of the Lake looks to be delayed indefinitely but if you are looking for a similar vibe, Lover Merman seems to be it. Also billed as a BL with a Merman lead, this is supposed to have drama, romance, mystical lore and more.

Lover Merman is a Thailand production.
Keeper of the Lake was to be from the Philippines.