Both dramas:
- tell story of childhood sweethearts,
- ML fell in love with FL since childhood,
- take place in work environment

Similarities:
- OS is about school and PYHOMS is about college life;
- ML are smart;
- sweet moments between ML and FL

Female leads in both dramas are stubborn and quick-witted. Both of them are favored by the emperor and create their own destiny.

Both dramas are about power struggle inside the palace. In terms of actors Charmaine Sheh is acting in both of them.

Both dramas demonstrate the hardships of being a concubine, the struggle for power in the palace/household.

Even though Joy of Life and Douluo Continent are different in terms of visual FX and plot, both dramas:
- are very captivating as adventure series,
- have a romantic storyline, but do not revolve around it only,
- the ML is growing his powers throughout the whole show,
- have great stories for supporting characters,
- ML has loyal friends and seniors who teach and support him greatly.

In both of the stories the ML waited for FL's reincarnation to love and protect them for a lifetime.

Similarities:
- good-looking and gentle FL,
- strong ML who have high status,
- ML is crazy in love with FL,
- pretty costumes,
- there's a child in both stories