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Operating Segment Information - Schedule of group's revenue from external customers by geographical areas (Detail) - HKD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | $ 825,184,760 | $ 680,477,636 | $ 607,263,125
Capital market solutions [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 581,932,693 | 680,477,636 | 607,263,125
Digital solutions and other services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 183,572,996 |  |
Fashion and luxury media advertising and marketing services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 59,679,071 |  |
HK [Member] | Capital market solutions [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers |  | 676,711,632 | 590,441,983
CN [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 787,907,146 |  |
CN [Member] | Capital market solutions [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 581,932,693 |  |
CN [Member] | Digital solutions and other services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 182,111,835 |  |
CN [Member] | Fashion and luxury media advertising and marketing services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 23,862,618 |  |
Other Countries [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 9,835,687 |  |
Other Countries [Member] | Capital market solutions [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 0 | $ 3,766,004 | $ 16,821,142
Other Countries [Member] | Digital solutions and other services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 1,461,161 |  |
Other Countries [Member] | Fashion and luxury media advertising and marketing services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 8,374,526 |  |
Europe [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 18,030,423 |  |
Europe [Member] | Capital market solutions [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 0 |  |
Europe [Member] | Digital solutions and other services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 0 |  |
Europe [Member] | Fashion and luxury media advertising and marketing services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 18,030,423 |  |
America [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 9,411,504 |  |
America [Member] | Capital market solutions [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 0 |  |
America [Member] | Digital solutions and other services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | 0 |  |
America [Member] | Fashion and luxury media advertising and marketing services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue from contracts with customers | $ 9,411,504 |  |

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2022-03-24 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_114&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2022-03-24 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_113_a&doctype=Standard -URIDate 2022-03-24 + Details
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