Another World

ML gets hit by a car and wakes up in a bed chamber. He discovers his sudden role as an emperor, meant to aid a god named yellow dragon in order for the empire to prosper. However, his life in this world is endangered and is often reeled between reality and a dream. It's up to him to choose whether to go home or seek the yellow dragon he has learned to love.

FL drowns from saving a cat but resurfaces in a world where cats have humanoid forms and humans are treated as strays or pets. Naive and unprejudiced of others, she tries to thrive in a place where she has become a pet of the cat who hates humans.

strong second lead syndrome only because the second lead is originally the male lead and had more impact than the reversed role of the second lead to main lead