Hyperconnect Inc.

Byung Jong Kim

Sang Il Ahn

Eun Hee Choi

Provided is an operation method of a server for relaying a call. The server relays a preliminary call between a first terminal and a second terminal for a preset time, based on matching of a first user of the first terminal and a second user of the second terminal, and after the preset time has elapsed, receives, from the first terminal and the second terminal, a response as to whether to continue the preliminary call. The server may determine whether to proceed with a main call based on the received response.

Methods, systems, and computer program products for providing video call service

Provided is an operation method for a terminal performing a call. A first terminal may receive a first like signal transmitted from a second terminal to a server, and may transmit, to the server, a second like signal regarding a second user of the second terminal. At this time, the first terminal may receive a signal for establishing a call connection between the first terminal and the second terminal, and may perform a call with the second terminal based on the signal.

Provided is a method of visually displaying a countdown time on a graphical user interface. A countdown time is set, the width and opacity of an area that changes as the set time is sequentially counted down are determined, and the area that changes based on the determined width and opacity is output on the graphical user interface.

Growing community of inventors

Seoul, South Korea

Byung Jong Kim