According to the story at the end of DD4 Xaio Wu died and was reincarnated(without memories) in the Shenlan world & Tang San followed her to reincarnate(with memories) by committing suicide. He found her but she is a stranger, he is in the process of wooing her again while facing various tribulations. In DD4.5 Tand San & Xiao Wu hasn't returned after reincarnating, its been 1000+ years since then. Ch 51 there was a mention of Tang San in a discussion among 4 Godkings. In the last line the point of view change to Tang San sneezing and complaining that how unlucky he is to be born again on Shenlan world. Does this mean that DD5 is ending with Tang San's death or both his & Xiao Wu's. His pursuit was unsuccessful?
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Author said that douluo dolu 5 will have a happy ending. TS and XW both reincarnated in SL5. They won't die but return to the GGC and have a family meeting most probably. It won't have a bad ending.