Actor Kim Sung-kyu created tension in the drama with his first appearance in SBS's 'Taxi Driver 3.' Kim Sung-kyu appeared as the mysterious character 'Go Jak-ga' in episode 12, leaving a strong impression on viewers. This episode dealt with complex criminal methods involving secondhand transaction fraud and cyberbullying, depicting the process of uncovering the true nature of the crimes.

The Rainbow Transportation team discovered during the interrogation of a part-time worker involved in the secondhand fraud that there is a behind-the-scenes force targeting those who want to become criminals. Following this, Do-gi (played by Lee Je-hoon) and Director Jang (played by Kim Eui-sung) tracked suspicious clues and headed to the northernmost island, Samheungdo. On Samheungdo, a strange atmosphere seemed to be watching the two, heightening the tension.

Go Jak-ga smoothly spoke as he got into the taxi, carrying a camera and tripod. He addressed the islanders, saying, "People of this island, don't you find this strange?" revealing an uncomfortable air. Despite his brief appearance, Kim Sung-kyu effectively conveyed the mysterious aura and tension of 'Go Jak-ga.' Behind his bright smile was a sense of distance, and his casually thrown words carried a sharp attitude.

In particular, his gaze toward Do-gi and Director Jang and the meaningful line he left at the end gave a chilling feeling. When he got off the taxi and walked alone, his expression turned cold, hinting that this character would be a key figure shaking up future developments. As the episode approached its ending, the atmosphere of the drama grew sharper, and Go Jak-ga's appearance acted as a signal marking the start of a new phase.

There is growing interest in what connection 'Go Jak-ga,' played by Kim Sung-kyu, has with the mysterious island Samheungdo, how the villains who lured the Rainbow Heroes to the island will reveal their cruelty, and how they will confront Kim Do-gi.

Meanwhile, 'Taxi Driver 3' airs every Friday and Saturday at 9:50 PM. This episode's unprecedented ending heightened anticipation for the next installment. The drama explores the boundary between crime and justice, providing viewers with tension and intrigue. Kim Sung-kyu's 'Go Jak-ga' is expected to play an important role in the upcoming storyline.