Fall In Mistaken Love summary:

The most charming Leader Commander of Wei, Wei Yu was severely injured under the sword of the Night King of Chen on the battlefield. He woke up in a body that he did not recognize—charming, fair, and with a delicate-looking face. Under the arrangement of King Wei, he was forced to marry and assassinate the Night King using a fake identity as “Xie Qingyu"". Wei Yu was once a shining star as a general. Little did he know, he had to be sexy and seductive to a man, to assassinate his enemy and complete the mission. However, the most unexpected things were the feelings and his plays toward the Night King had become real...