Park Hye-In

The protagonist, an egocentric man who's led a successful life as the CEO of a company in modern society is murdered and reborn as a beautiful lady named Paril Hall Mcgryued from a noble family in a fantasy world. Once he wakes up, (now in the body of Paril,) he finds out that he's now in the body of an "inferior being" and that all his wealth, achievements and successful life have vanished. Therefore, he decides to rebuild everything from scratch and make it to the "top of the pyramid" in this parallel world. \*This version appears to have been replaced with a new version; check relations. Korean Novel (Comic GT) Korean Novel (Comico) Korean Raw (censored) Japanese Raw (free 1-5, paywalled 6+)

Lee Wee Jin has to cope with his tyrant sister on a master-slave basis everyday. Trying to fool himself he evades reality, thinking she's tsundere and that she really likes him. Suddenly, these delusions become all too real.