My Puppy Returns as a Billionaire

It's me, Sera! One day, a rich heir, Cha Woojin, possessed by the spirit of Sera's pet dog Ppoppi, knocks on Sera's door with a dog collar around his neck. Ppoppi's spirit returned to find a partner for its lonely owner right before its death, but Sera grows suspicious of this weird guy who turns into a completely different person at 8 PM every day.