The Chronicle of Human-Machine Ascension

When Xia Feiyu awakens as a "healer" and discovers that the System bound to him, Xiaotian, is a sharp-tongued, sarcastic battle cheat, his whole story goes completely off the rails.

Other healers: miraculous healing, the team's support.

Xia Feiyu's healing: poison miasma for protection, fists and kicks to send enemies to the afterlife! Teammates? They don't exist. The best treatment is making your enemies lie flat!