It's been three years since we heard the flawless collaboration stage between Teen Top Niel and Juniel.

The two reunite with each other during Niel's comeback stage at M!Countdown for his repackaged album's title song 'Spring Love' featuring the ever sweet and pretty Juniel.

Both flutter hearts once again with their amazing harmony wherein each of them possesses distinct vocal color in this sweet love song. Watch their performance below: