Return of Happiness (2015)

Brother and sister grow up in a poor environment and learn to depend on each self at a young age. Always trying to ease the burden for the other. But the siblings are not related by blood, but one is the spouse of a rich household.

Similar stories with two girls from different backgrounds changing identities. A girl from a wealthy family loses her memory while another one consciously deceives everyone. Male lead and female lead met in childhood. Male leads in both are great (their characters).

Similar concept of interchange of identities of a poor and a rich girl.

Similarities:
- In both, the daughter of a rich family gets amnesia and gets brought up by poor family
- Replaced by the original daughter of the poor family
- The daughter falls in love with childhood child that she can't remember

Differences:
- Because of You is fewer episodes
- Because of You has a better OSTs

If you had a choice, choose Because of You