He told him the biggest lie.
Yue Huayan, the prince's companion, fell in love with the indifferent prince, but he understood that this was just a delusion that could never be realized. His Highness likes his biological sister Hua Ji. The two of them have almost the same appearance and completely different personalities.
So he placed his extravagant hopes on his sister. But God's will plays a trick, and Ji'er's departure caused His Royal Highness the Crown Prince to lose almost half his life. Hua Yan, who also lost his sister, entered the palace to take care of the Crown Prince under the instruction of the Queen.
Because he has the same appearance as Ji Er.
Conception: