Review Detail of _PaiSen_ in History's Strongest Son-In-Law Living With The In-Laws

I just finish reading the novel... I must say I enjoy it... But I somewhat disappointed at the end(450 chapter) because the story drastically change... I enjoy the funny MC and the army war but those where almost gone at the end... The MC became to serious and mature which is not bad but still what catches my attention to read this is literally the funny and shameless MC... And the last chapter titled 'happy ending'? For me that is not happy ending... The author dramatize it that after reading, I cannot feel the happy ending... Lastly the harem, it was a force harem for me... It's like for it to become harem, the author just randomly inserted girls in his harem that is not necessary at all... Even without the harem it will not affect the story...