I had only read the first 2-3 chapters(English translated in Mangafox, colour manga, wuxia, released after 2014) and don't remember its name. If any one feels this is familiar please tell me. This manga was mistakenly put in 'Star Martial God Technique'(Not sure if the title was the same but it had the same cover art in the description) in mangafox and removed later. The story is: The mother and father was killed. The brother and sister was separated at a very young age. The sister does not know that she has a brother but the brother knows and is searching for her. The story starts by the brother finding the sister. The sister is the successor to the sect master of a powerful sect(probably). The sister runs away from cultivation and lies down on the rooftop of the sect buildings and there they meet. The brother does not reveal his identity and they befriend each other(like a typical chance meeting of a MMC & FMC) and they grow closer. The brother entered the sister's sect as a outer court disciple(I think?). The brother is actually a spy(assassin) send by a his master(I think? and powerful character, female) to spy on or maybe kill the sect master(maybe the sect master's successor(his sister), not sure). The brother's master raised him. The master is the one that killed the brother's parents and the reason he and his sister was separated. The master does not know that her disciple knows about this and that the one she send him to spy on or kill is his sister. The master maybe does not know that he has a sister. Now he has to protect his sister in the shadows and exact his revenge on his master.