Reincarnation, past lives, and the concept of death vs. life/immortality are very major themes in both series, only the FL is the supernatural being in SYIM19L, whereas the male lead is the supernatural being in Goblin. There is also bromance between the male leads in both series. Goblin is slightly more melodramatic and poetic than SYIM19L, but if you liked the romance in Goblin, you'll definitely enjoy the romance in SYIM19L.