Haibai, mama

Cha Yu-ri died in an accident five years ago, leaving her husband Cho Gang-hwa to raise their daughter by himself. She becomes a ghost and watches over them until one fateful day she is brought back to life by the deities and told she can become human again if she returns to her place in 49 days. Though her husband has remarried, so she must decide between her or his happiness as she slowly re-integrates back into her old lifestyle.

Shh! It's a secret that I'm watching!