World renowned doctor of engineering Caff who'd always been ridiculed for his small stature disappears one day. He kidnaps Young-hee's father Dr. Yoon who is a physicist. But Hoon, who still hasn't gotten over his failure to save Miran, refuses to get in the control seat of Robot Taekwon V again. However, they rescue Suelle who was chased by Caff's spaceship. But she is actually spy for Caff and she begins to siphon information about Robot Taekwon V's features and technical information. Suelle falls for Hoon but when she is found out by Young-hee, she runs away to Caff. Dr. Yoon researches energy 90 as part of Caff's plans to take over the universe.

Robot Taekwon V 90

Moodori is a small village in the mountainous province of Gangwando South Korea. The village revolves around three elderly men named Bong-Gi, Hae-Gu and Bang-Yun. The fortunes of the village gets turned upside when a young man that was passing through town commits suicide there. The young man turns out to be the webmaster for a website centered group assisted suicides. The town of Moodori becomes a destination of sorts for other people looking to commit suicide. Now the three elderly men decides to take advantage of their village’s sudden popularity by opening an inn set up to accommodate the influx of travelers coming to Moodori to end their lives.