Both series have a very strong Bromance bromance theme and humor. Stand by Me is mostly republican mystery/drama/comedy whereas Towards the Truth is more ancient mystery with supernatural and not specifically mentioned as comedy, though I find parts funny.
Both are historical dramas with a strong bromance between the MLs who work together to solve strange and complex mystery cases. One of the MLs is a talented cook.
Both are historical dramas with a strong bromance between the MLs who work together to solve strange and complex mystery cases. One of the MLs has a connection to the one responsible for it all. Both are shorter dramas.