HYPE DETECTIVE · Collapsed

Giant castella: how much more did the hype cost?

Seventeen brands competed in 2016; after a March 2017 exposé, two leading brands went from 32 to 3 and 19 to 2 franchisees.

Pre-hype priceNot collected
Peak price₩6,000~₩7,000
Current priceNot collected
Cost floorNot collected
Peak ÷ cost floorNot collected
Hype half-life14 days
Operating stores vs observed peak9% (Danshui giant castella franchisees)
Spike → big retailNot collected

“Not collected” means no sourced number yet; gaps are never filled from memory.

PRICE TIMELINE

How the price moved

2017-03 · Peak · Single source
₩6,000~₩7,000 1 cake
Korean franchisees (owner accounts) · 한국경제 — 대왕카스테라 도미노 폐업… 먹거리 X파일 때문에 생계수단 무너져(2017.3.28)

ESTIMATED COST FLOOR

What it takes at minimum

Not enough public price and recipe data to estimate yet.

STORES

How stores grew and shrank

2016 · Brand · Single source
32 Danshui giant castella franchisees
비즈한국 — 흑당 버블티 인기 얼마나 갈까… 왕년 대박 아이템의 그림자(2019.5.2, 가맹사업정보 인용)
2017 · Brand · Single source
3 Danshui giant castella franchisees
비즈한국 — 흑당 버블티 인기 얼마나 갈까… 왕년 대박 아이템의 그림자(2019.5.2, 가맹사업정보 인용)
2016 · Brand · Single source
19 Taiwan Rock castella franchisees
비즈한국 — 흑당 버블티 인기 얼마나 갈까… 왕년 대박 아이템의 그림자(2019.5.2, 가맹사업정보 인용)
2017 · Brand · Single source
2 Taiwan Rock castella franchisees
비즈한국 — 흑당 버블티 인기 얼마나 갈까… 왕년 대박 아이템의 그림자(2019.5.2, 가맹사업정보 인용)

Danshui giant castella franchisees: 2017 operating count is 9% of the observed 2016 peak

Taiwan Rock castella franchisees: 2017 operating count is 11% of the observed 2016 peak

SEARCH INTEREST

When search took off and cooled

050100half20152016201720182019
Google search interest (South Korea, weekly, peak = 100) · bold line is the 4-week average · 2015-06-01 2019-12-31
Show weekly values

2016-10-23 7 · 2016-10-30 10 · 2016-11-06 11 · 2016-11-13 11 · 2016-11-20 10 · 2016-11-27 19 · 2016-12-04 21 · 2016-12-11 23 · 2016-12-18 26 · 2016-12-25 27 · 2017-01-01 29 · 2017-01-08 25 · 2017-01-15 16 · 2017-01-22 18 · 2017-01-29 18 · 2017-02-05 16 · 2017-02-12 13 · 2017-02-19 9 · 2017-02-26 8 · 2017-03-05 8 · 2017-03-12 100 · 2017-03-19 38 · 2017-03-26 44 · 2017-04-02 21 · 2017-04-09 9 · 2017-05-14 7 · 2019-06-02 6 · 2019-06-30 6

Take-off (25% of peak)
2016-12-18
Peak (4-week average)
2017-04-02 · single-week high 2017-03-12
Hype half-life
14 days (half of peak by 2017-04-16)
Latest
2019-12-29 · 0/100

HYPE LIFECYCLE

Lifecycle and timeline

  1. 1. Discovery
  2. 2. Early viral
  3. 3. Search explosion
  4. 4. Price premium
  5. 5. Store expansion
  6. 6. Large retail entry
  7. 7. Peak
  8. 8. Saturation
  9. 9. Decline
  10. 10. Survival / disappearance

Now: Survival / disappearance · Collapsed · Hype only — After a March 2017 broadcast, sales collapsed and leading brands lost about 90% of franchisees within a year

2016-12-18 · Viral / search · Unknown
Search interest rises (passes 25% of peak)
Google Trends — 대한민국 웹 검색, 주간(키워드별 정점=100)
2017-03-12 · Broadcast · Unknown
Channel A “Food X-File” broadcast — the week search interest peaked
한국경제 — 대왕카스테라 도미노 폐업… 먹거리 X파일 때문에 생계수단 무너져(2017.3.28)
2017-03-28 · Closures · Unknown
Owners report ~90% sales drops and closures after the broadcast
한국금융신문 — 대왕 카스테라 양심업주 매출 90% 급감, 결국 폐업(2017.3.28)

Organic, paid or sponsored spread is shown only when public records confirm it; no business is said to have engineered a fad.

WHO CAPTURED THE HYPE PREMIUM

Who captured the hype premium?

Confirmed revenue source
Franchise HQ — Franchising
Danshui operating profit ₩184M (2016) → ₩96M (2017); Taiwan Rock ₩187M → -₩1.035B
Confirmed revenue source
Franchisees — Store sales
A shop selling 250 a day at about ₩7,000 reported a 90% drop after the broadcast

Only published figures count as confirmed; a clear mechanism without amounts is “likely”. No made-up scores.

REPORT A PRICE

What did you pay back then?

Many pre-hype and peak prices are missing. Reports with receipts or photos are reviewed and shown separately as user reports.

SOURCES

Sources

Last checked 2026-10-02

DETECTIVE RADAR

Giant castella from other angles

  • Origin DetectiveApplies · not analysed yet
  • Cost DetectiveApplies · not analysed yet
  • Distribution DetectiveApplies · not analysed yet
  • Inflation DetectiveApplies · not analysed yet
  • Discount DetectiveApplies · not analysed yet
  • Value DetectiveApplies · not analysed yet
  • Hype DetectiveThis page
  • Hogu IndexApplies · not analysed yet
  • Tax DetectiveApplies · not analysed yet
  • Wage DetectiveApplies · not analysed yet
  • Ingredient Detective (food & drinks)Applies · not analysed yet
  • Regulation DetectiveApplies · not analysed yet

✓ analysed · △ applies, not analysed yet · not applicable: Privacy Detective · All axes on one page