Killed by a Teammate's Healing From the Start! I Awakened a One-of-a-Kind Talent

It attracted me unexpectedly. In the first two chapters, I found it boring and unexciting. I endured my displeasure and persisted in reading another chapter. Suddenly I felt no sleepiness at all. I couldn't help it anymore. I just looked at it and kept flipping through the pages. I felt refreshed. I decisively put aside other literary ideas temporarily and looked at the present chapter by chapter. Just one word, happy! Don't be surprised if you're not good at math.