Is It Wrong To Fall In Love With An Angel?

Son Naeun is an angel while Jung Jinyoung is a human.A human who never fell in love.A cold human or people called him selfish.But that will change when he saw an angel sleeping peacefully on his bed.He didn't know why but his heartbeat increased.He looked at the angel,he smiled widely for the first time in his life.But is it wrong to fall in love with an angel?