Spoiler!
There is no mention of how he did or did not die but Qingyan's boyfriend Wen Ran from prev life also travelled back and he told him that it was Gu fei who digged out every thing that happened to yan yan and the mistreatment he received and brought the truth to light. he exposed everything to the media. wen ran saw Gu fei in front of Yan yan's grave carrying red roses looking soo lonely and desolate. Wen ran died a year after yan yan in an accident.