Zhang Wansen's Regret

I really want to know what it would be like if this novel was written from Zhang Wansen's perspective. If this drama is a double time travel, what kind of sparks will it create? Is Zhang Wansen really jumping into the sea in the end? Why was Lin Beiqing able to travel back in time? Who is the old man in the story? Looking back at the sea, is it a dream or reality? Why is that phone still there? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.