Infinite Planes Two-In-One

System: 1+1=2 so D+D=CC+C=B Liu Yu: So I only need 1, 2...16 D-level items to get S-level items? System: Yes, the biggest purpose of this system is two-in-one. Others are side jobs, please make reasonable use of the synthesis function. Liu Yu: Qiang, I am invincible. Liu Yu: Dazhu, do you want me to install two pairs of reincarnation eyes for you? Hawkeye: Why do you have so many black knives? Liu Yu: Because I have a system. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.