A team led by Chinese scientists analyzed historical data from the FAST telescope to scan 33 exoplanetary systems, identifying a narrowband radio signal designated NBS 260108 in the direction of the red dwarf system K2-155, approximately 238 light-years away. The signal exhibits two artificial characteristics of interest to SETI: an extremely narrow frequency band and a regular drift in frequency over time. K2-155 hosts three super-Earths, with the outermost planet located at the edge of the habitable zone. The team remained cautious about the conclusion; subsequent checks revealed that the signal appeared strongly only in a single polarization channel, and that similar features also appeared in observations pointing toward three other stars. Based on these findings, the researchers concluded that human-made or instrumental interference is a more reasonable explanation than a transmission from an extraterrestrial civilization.