38 Task Force (2016)

both are about fraud who become mr righteous by helping people in need, but Chief Kim is funnier

In general it is similar because it is about con artists

Specific similarity is that main leads have the intend of stealing money from those who obtained that money illegally in the first place.

they both have a solid team, and they are both about something different than the usual "crime/investigation" team ups...

Taxi Driver is more serious, whereas 38 Task Force leans more towards comedy.
In both dramas you have a group of people fighting for justice.

Both dramas are about a unusual group of people who con bad people because the legal means to justice have failed them.

it's all about con artist.. although 38 task force focus on swindling tax evaders, kurosagi is more on robin hood act by helping the swindler victim by swindling the swindler back.

Both The Fiery Priest and 38 Task Force have highly passionate main characters leading elaborate schemes against a large cast of the powerfully corrupt.
Both explore characters that are morally grey (especially with their main characters, but also applies to characters that start out as villains but turn into allies).
Both are fast paced and give small victories with each episode so that you're not frustrated despite the high stakes and twists and turns.
Minimal romance in both dramas, but The Fiery Priest is funnier.

Both feature a conman character teaming up with a government worker to catch bad guys through unorthodox means.

Both are male centric stories about hot scam artists. Seo In Guk plays the con artist and Mah Dong Suk is the guy who gets screwed over and involved in doing scams himself, and in SCAMS Sugino Yosuke joins Otani Ryohei who works for a yakuza (both HOT beautiful men), and Scams is a little more mature with more adult and darker content. Squad is a bit more positive and preachy at times but Scams is more realistic and mature.

Both 38 Task Force and The Con Artists focus on conning and quests to acquire money. 38 Task Force deals with conning owed tax money while The Con Artists is about a big heist for personal benefit.

In both of these dramas the main character is con artist portrayed by Seo In Guk. Both dramas also feature elements of comedy and mystery.