Goblin, being one of the famous series must be a good watch/rewatch after Tomorrow.

Both involve grim reapers, souls, a touch of the afterlife, and a crossover between the two worlds (the living and the dead) with some comedic moments among the characters. But, Goblin is more romantic with bromance and a cute depiction of youth life and Tomorrow is a slice of life depicting forms of suicide and suicidal thoughts and shows different challenges of performing as a team.

Like Tomorrow, Goblin also tackles a youth's dream and future which will also make you think of your own and it has iconic teleportation effects that make it so enjoyable to watch.

Also, both flashback historical eras add a flavor to the drama- like you'll see them in traditional clothes and their visuals are perfect!