Iam not sure if its what you are looking for.
https://mydramalist.com/49955-my-supernatural-power
The Fl has some condition and the ml's heartbeat, putting her ear to his chest calms her down and relieves her sympthoms. And ml always magically appears out of nowhere. He also protects, trains, finds and saves her, or helps her.
The fl isn't as stupid/eccentric/annoying as the one in healer so you might not like her. The fl in healer was totally useless so im surprised you mentioned especially that drama.