Happened to notice this Strongest Deliveryman right after watching Start Up (2020). Both series deal with the formation of a company, a delivery company in one case and IT companies in the other case.
I find Strongest Deliveryman better written, with secondary characters better developed, better music, and a better crafted ending.
In spite of the writers of the series being different, the series share points, which cannot be coincidental. Here are two:
1. grandmas running eateries, who in both series play a fundamental role in starting the companies;
2. Kim Seon Ho, who has the second male lead role both series, is nicknamed "good boy" in both cases.