TST (band)
South Korean boy band formed by JSL Company in 2017
TST, formerly known as Top Secret (Korean: 일급비밀; RR: Ilgeubbimil), is a South Korean boy band formed by JSL Company (now known as KJ Music) in 2017. They debuted on January 4, 2017, with Time's Up.
History
2017–2018: Debut, name change and Kyeongha's departure
On January 4, 2017, Top Secret debuted as a seven member group under KJ Music Entertainment with the mini album Time's Up. The group then later came back with the mini album Wake Up on June 4, 2017.
On April 3, 2018, the group changed their name from "Top Secret" to "TST". On May 23, 2018, TST released their first single "Love Story". This was Kyeongha's last release with the group.
On May 24, 2018, it was reported that Kyeongha was found guilty of sexual assault. The victim stated that Kyeongha told her that she aroused his sexual desire while walking on the sidewalk, and when she ran away from him, he followed her into a building and sexually assaulted her in December 2014. His management agency denied the accusation, when the victim's online post began to circulate after his debut with the group.
This brief starts where responsible research should: with the source description of “TST (band)” as south Korean boy band formed by JSL Company in 2017. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the history & society register because the source frames it as south Korean boy band formed by JSL Company in 2017. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Chronology, provenance and viewpoint should be read together before a broad social or political interpretation is accepted. The source revision retrieved here is dated Jul 2, 2026. The linked authority identifier is Q28418030. 1 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2017, 2018 and 2014.
Later summaries often reconcile disputed chronology or motive more neatly than the contemporary record permits. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Compare institutional narratives with records created by participants and affected communities. Dates and formal titles are useful anchors, but not substitutes for context.
- Event chronology
- Institutional context
- Locating named record creators
Contemporary correspondence, government or organizational records, oral histories and cited historical scholarship.
Three-step research path
- Establish the record: confirm the title “TST (band)”, its source revision and the description used here.
- Expand the search: follow TST (band) primary sources, TST (band) archive and band research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “TST (band)”?
- What chronology connects this entry to wider political or social change?
- Who created the surviving record, and for what administrative purpose?
Search terms from this dossier
This entry incorporates text from “TST (band)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.