https://mydramalist.com/16547-eternal-love in the second half of the show, she's laid back and lazy indeed.
https://mydramalist.com/29515-lub-luang-jai very mature, wise and calm. A bit boring to be honest. ..
https://mydramalist.com/209-summers-desire after the first 3 episodes she becomes laid back but not lazy.
https://mydramalist.com/19234-the-bride-of-habaek laid back and lazy, but not mature. More like tired.
https://mydramalist.com/23442-the-happy-loner
https://mydramalist.com/6756-the-masters-sun she's not lazy but she's lost her ambition and her pride. Basically nothing ever bothers her.
https://mydramalist.com/29133-witch-s-love she's immortal, no ambition and happy with her life.
https://mydramalist.com/21354-liang-sheng-can-we-not-be-laden-with-grief she's lazy and detached for the most part. But not mature at all, more like a big baby
https://mydramalist.com/11582-heart-to-heart she's a bit like this, even though she has problems.
https://mydramalist.com/6993-i-hear-your-voice at the beginning