In both dramas one of the partners loses his/her memory and can't remember the person they were married to or why they did marry them.

Both the main leads have been in jail because of their boyfriends, and both have to face the prejudice of society to ex-convicts later on.

Both dramas are about a handsome smart guy and a silly girl who lives in a complete mess. In both dramas the male lead tries to help her and bring some order into her life. Both dramas are very sweet and funny.

Both are historical dramas set in the palace harem that include romance and political intrigue. Also both dramas are about a young girl entering the palace and becoming the favorite of the emperor, having to deal with the jealousy and intrigue of the other women as a consequence.

Both are historical dramas in which the girl works as a maid in the palace and falls in love with a prince. Both dramas are full of drama and political intrigue.

Both dramas are very sad love stories set in the qing dynasty.
In both the female leads start as innocent girls and are forced to change due to the circumstances.
Both dramas revolve about palace intrigues of power, love, sacrifice and the life of the women.
Yongzheng Emperor also appears in both, in "Legend of Concubine Zhen Huan" as the ruler and in "Desperate Love" as a child.

Both are historical dramas about a strong forbiden love. Both have very strong characters, a lot of action and political intrigue.