Reunion is similar to Lost Tomb because of it's storyline and character based. Reunion is a sequel of the main story of Daomu Biji, thus it is also a continuation of the said series.
A main character hiding a secret regarding his health/life with last wish/goal to find remains/body of beloved family member before it is too late. Excellent bromance. Mystery. Humor. Mains solve series of puzzles/cases that all connect and lead up to end mystery/confrontation. Cornucopia of interesting characters throughout.