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

male lead jerry yan is same
in both jerry yan is an illegitimate child
in both jerry yan and his female lead have love triangle with his step brother
in both female lead work for his step brother's office
office romance

both female lead disguise as man and met prince , and prince found their real identity long before but kept it secret for female lead sake . when confront moment come prince express their love but both female lead reject it not because they don't love them its cause they can't love anyone they have their own responsibility/mission to complete so they don't want to distract themselves by it.

both FL engaged with ML who is crown prince of highest god/spiritual kingdom. initially FL avoid this engagement but she can't resist to avoid ML obsession for her and finally she fall for him. on the other side FL is hiding secret from ML and world that she trying to awake his great master from long sleep which is consequences of damage of his spiritual energy .

both drama involve FL as fake princess , replacement bride for ML who is crown-prince/king, one have throne without power other have power and desire for throne .

both have some similar concept male lead marry female lead to achieve his target against female lead family , have hold love and revenge as same time . push and pull relation always have flavor of hate/love/obsession .