you are a multi millionaire in Korea. You recently bought a Korean palace you liked and one day you were exploring the palace and accidentally touched a switch on the wall and revealed a room. There was four golden tombs there. When you touched one of them a bright light comes almost blinding than you see four Emperors of the empire standing there alive. Four of them coming from different timelines.

Zhu yangji: Where am I?

Zhen Yu: Didn't I die?

Shen yi: What is happening here?

Lan Wangyi: Why are we here?