Both dramas are from the 2000's and about mystery solving.
Both have a strong female lead as the main character.

Both dramas are about a guy who is trying to get his life back on track. One has left prison and the other has quit his job. The two main characters deal with past traumas and have family members to support them and stand by them.

Both dramas talk about Japanese traditions and having to inherit the family business. Also, both have romance involved.

Both stories are set at a movie theater and have cinema as a main theme.
Also, they both happen in the past.

- Both dramas have the same actress (Yuriko Yoshitaka) as FL.
- They are both stories that involve a mystery and an investigation.

The same kind of vibe, with gangs, territorial fights, and a bit of dark comedy. Also, there is an unsolved crime in both dramas, and the main characters help with the investigations. The main character of both shows have to deal with coming of age matters.

Both are about guys who didn't know each other, and are very different from each other, but because of unexpected events, become friends. Also, in Pu-Pu-Pu, the three boys throw away everything and start working as part-timers while in Beach Boys the two guys leave their jobs and life behind to work in a Hostel. Therefore, I reckon the two dramas are quite similar.