Blade & Soul M is apparently a re-work of the original PC game designed for mobile devices. Development of Blade & Soul M is led by Team Bloodlust, the original group who made the PC game. NCsoft claims it will bring together the “original work and high-quality graphics” to mobile. New features include “advanced forms of combat” and “actively changing environment”.

Made using Unreal Engine 4, players will experience “realistic expressions based on environment changes such as time, weather, and topography”. Another new feature mentioned is a story branching system, where players might have different outcomes based on their choices made. Each choices made by different players will affect the overall game world.
https://mmoculture.com/2018/11/nc-me...lly-announced/