KASI has been developing a next-generation coronagraph (NGC) in collaboration with NASA. The joint mission is designed to deliver a comprehensive data set to answer the questions on the origin of solar wind on the Sun, and how the nascent solar wind is accelerated to several hundred kilometers per second within 10 solar radii. Unlike traditional coronagraph, NGC will obtain density, temperature, and speed of coronal electrons simultaneously. The mission has three steps: DIagnostic Coronagraph Experiment (DICE, 2017), Balloonborne Investigation of the Temperature and Speed of Electrons in the Corona (BITSE, 2019), and COronal Diagnostic Experiment (CODEX, 2013). In this talk, I review the past and current status of the mission, and introduce planned ones toward the NGC.