Many top Korean idols have pre-debut photos and videos that have circulated on the internet. There are those that are beautiful and funny, then there are those that are amazing. In this article, we'll share with you 5 videos that prove why these female K-pop idols are the main vocals of their groups!

1. aespa NingNing

First on the list is aespa's youngest member, the vocal powerhouse, NingNing!

She was part of SM Rookies girls, but before that, aespa's bright and funny maknae have broadcast experience already. She was a contestant in a Chinese singing contest for kids "Let's Sing Kid" in 2015.

Fans who found out that NingNing joined the contest and watched her video on Youtube were amazed at how she was that good at singing prior to SM entertainment training.

The female idol rookie was only 13 years old when she showed that she will be a future main vocal of a girl group.

2. Red Velvet Wendy

Next on the list is Red Velvet's Wendy. This Korean-Canadian idol had released an OST prior to Red Velvet's debut. But that was not the video that made the idol really known for having great vocals.

Wendy has showcased her vocal prowess in her high school before. A very famous video of Wendy singing Beyonce's "Halo" while sitting down got her fans' acknowledgment regarding her main vocal status.

But that is not the only pre-debut video of Wendy that got her attention. She also has a video singing Taylor Swift's "Speak Now" in one of SM Entertainment's monthly evaluations.

3. MAMAMOO Solar

Our number three is none other than MAMAMOO's leader, Solar.

Solar is one of those main vocalists who not only has natural talent but also practiced very hard to achieve what she has right now. She has been rejected by more than 40 entertainment companies.

However, it all worked out because she became one of MAMAMOO's members and they formed a really powerful vocal group.

She has many amazing pre-debut videos, but this one video of her singing a Whitney Houston song takes the cake.

Watch how Solar became MAMAMOO's main vocals when the four of them are all main vocal materials.

4. fromis_9 Jiwon

A supposed to be TWICE member, fromis_9 Jiwon is definitely one of the most amazing vocalists of the 3.5 generation of K-pop.

Debuting in 2017 after joining another MNET survival show "Idol School", there are many times that this '97 liner idol has proven to us that she has an outstanding voice.

But in this article, we'll show you pre-debut Jiwon and how JYP wasted her talent. Watch her live performance with TWICE Chaeyoung and Momo singing "The Way You Love Me."

5. LE SSERAFIM Yunjin

Another main vocalist who made it to the list is from one of MNET's survival idol shows, "Produce 48," LE SSERAFIM Yunjin!

She is known by fans as an amazing opera singer. She also showed her vocal power during "Produce 48" when she sang SNSD's "Into The New World".

Here is her video. Watch her opera singing below.

Is your favorite part of the list? If not, maybe you can share with us who it is!

KpopStarz owns this article.

Written by Jaswin Singh