If a film has a mediocre first half and a fantastic second half, then with high probability, it is going to get mixed or generally favorable reviews. To the contrary, if a film has an acceptable first half and a boring second half, it is doomed to receive unfavorable reviews. Unfortunately, "Never Say Die" belongs to the latter scenario.
First of all, the male lead, Allen, is a miscast. The role Edison is a professional boxer, and the actor for the role should be a muscle guy. Yet Allen has essentially no muscle, and barely looks like a professional boxer.
Secondly and more importantly, the story is not cohesive. The first half of the movie tells a body swap comedy, but in the second half, a clichéd revenge story is told instead and does not seem to be much related to body swap.
To make things worse, the plot is totally predictable. When you watch the first 1/3 of the movie, you can tell what is going to happen next. This is disastrous for filmmaking.
Moreover, most of the jokes in the movie are not funny at all. The only impressive scene is the cameo appearance of Yin Zheng and Wang Zhi, who starred in the 2015 film "Goodbye Mr Loser".
All in all, the rating for this movie is 3/10 at the very best.