In this video, Ronny Chieng, shares the story behind some of Korea's most successful singers. Find out more by watching the video.
Some vocabulary to understand the video:
A breakthrough - an instance of achieving success in a particular sphere or activity.
A wave (in the context of this video) - a sudden increase in a phenomenon, feeling, or emotion.
A requirement - a thing that is needed or wanted.
To launch - an act or instance of launching something.