Korean webnovel about someone isekaied into a video game based on the Romance Of The Three Kingdoms. The isekai character is Soyeon Jin, but the actual protagonist is named Jeon Ho, a minor bandit leader who follows Soyeon Jin and becomes a major general in her warlord army. It's a 18+ harem story, so many of the leading protagonists of RoTK have been subject to Genderswap.
The novel is paywalled and requires login to read.