Begin to Strengthen Yourself from the World of Classmates

The protagonist goes through thousands of worlds, first strengthens his heart, and then his body, leaving endless legends in thousands of worlds, just to be able to go through thousands of sails and reach the other side. Ps: Starting from the time when we were classmates together, the next film is tentatively scheduled for Love Story, Golden Years, etc. Newbies are starting out, please give me some advice. This novel and its characters are purely fictitious and any similarity is purely coincidental. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.