According to reddit user u/ergws_2, a Weibo post from Zhang 'xiao8' Ning initially stated that the team were having an internal argument and decided to GG out of the game.
Both Xie 'Super!' Junhao and He 'InFlame' Yongzheng later posted to their own Weibo pages. According to u/ergws_2, they cite poor communication and Super's fever leading to a lack of control of emotions.
Source: [url="https://weibo.com/5708275526/Fvcfgucz7?from=page_1005055708275526_profile&wvr=6&mod=weibotime&type=comment"]Super's Weibo[/url]
Source: Inflame's Weibo
This was the third and final game of the lower bracket series, meaning LFY missed their chance to qualify because of this loss. It's been a pretty disappointing season for the team that came 3rd in TI7 as they've repeatedly come close to qualifying for events but largely missed out. They recently qualified for their first LAN with a win in DPL Season 4 (Top) Playoffs, which took the place of Chinese playoffs for Mars Media Dota 2 League: Macau 2017.
Photo of Super via EPICENTER