Boy saves family with fire spinning (help find this manga!)

Trying to find the name of a manga(manhwa, manhua) where the protagonist goes back in time and saves his parents from drowning in a boating accident at night by swinging a fire lantern around on the beach. They own a farm, his mom gives birth to a sister, and his dad invents a pesticide which prompts people spying on them? And there's also some old "crazy" guy who's brother or dad willingly drowned so the kids parents could live. Please, it's been stuck in my head and I've been searching like crazy haha.