**_A great watch … worth it!_** _**WARNING**: Contains information others might consider as a spoiler._ **I. Story** _a. Episode stories_: The stories per episode were mostly good. Out of 16 episodes, I like the story of 9 episodes. _b. Series story_: From the title, "Start-Up" (or "Sandbox"), it gives the impression that it is primarily about starting up a business or about joining a, well, sandbox program. However, overarching story is more about [1] a love triangle and [2] sibling rivalry. The impression from the series title only takes tertiary importance. It would have been bette...