Group 1 - Liu Mengzhang and Qi Sijun have reportedly broken up after approximately 6 years of dating, citing differing future plans as the reason for their separation [1] - The breakup is described as amicable, with no issues of infidelity involved, and Liu Mengzhang has stated that she is gradually moving on from the relationship [1] - Qi Sijun has gained popularity through various reality shows, while Liu Mengzhang previously worked as a host for CCTV's financial news channel and participated in several major programs [1]