Traveling Through Mountains and Rivers

"If you had the ability to time travel, what would you do? Do you have people you miss, unfinished agreements, and truths you want to explore? " He's the best friend I've ever had. At his funeral, I met the impossible guy. Together we travel back in time to try to find out the truth behind his death. Every step brings me closer, but it also makes me less and less able to understand him. Until I decided to go back to the day we first met. This time, I just want to be with him. No matter what the ending is.