Circular Convention is a Manga/Manhwa/Manhua in (English/Raw) language, Manhua series, english chapters have been translated and you can read them here. You are reading Circular Convention chapters on ManhwaZ, fastest updating comic site. The Summary is
A serious accident happened in the school, Zong Luofeng escaped from being hospitalized due to his illness, but his friend Lu Yun and his crush Chen Yao died unexpectedly. He has gone back, when all the tragedies did not happen and he get to meet everyone once again… This time, will he be able to change the tragic ending?