immortal male lead waiting for many hundreds, thousand years for the right person the female lead who can heal him of his pain, loneliness and sadness .

immortal and human realm concept
immortal send to human realm for their tribulation
beautiful scenery and graphics used

both female lead are great in war strategy as well as the both male lead are great war fighter and admirer of female lead . happen to be enemies to lover.

prince always found his cinderella
that he cherish
both trust each other without questioning
both couple have really great chemistry

both Japanese drama with same plot awkward situation of marriage at first then slowly develop or learn to relation/love . the drama shows the initial feeling of love, when butterfly travels in your stomach . and by time going every layered to be revealed of their life with different flavor jealousy, care, obsession's , fear and past experiences with light note.

FL time travel to change the events or prevent events to occur with limited life span.

marriage without love , awkward and causal relation

two different species fall in love in ancient time and tragically died , something missing or incomplete they want to fulfil so incarnated in 21 century for their eternal love.

mischievous FL and cold ML marriage, arranged by royal edict . both have hesitant/suspicious/secret behavior to accept the marriage but force by circumstances . FL is victim of her step sister's bully . cute romance .

both drama have main characters childhood dark incident and because of that one character got weird illness both drama have one character is cure of other character. boss employee theme both drama have.

dr. koto synopsis first few line remind me romantic dr. kim

both female lead is cop and have special ability of to solve case after got on an accident