[19][20] The revamped group released a single titled "Nothing Lasts Forever", and went on to become one of the most popular and commercially successful musical quartets of its era.

[26] After her 4-day long appearance on Real Men in August 2014, a brief clip of her showing aegyo at her instructor went viral in South Korea, reaching one million views in a day, an unprecedented feat at the time.

[31] In November 2014, Hyeri was cast as one of the main characters in teen drama Schoolgirl Detectives, which began airing on cable channel JTBC in December.

Due to the series' status as a cultural phenomenon, the actress was chosen by the Madagascar delegation to become its official flag bearer at the 2018 Winter Olympics Opening Ceremony.

She has been described as a "blue chip" in the entertainment industry due to her "frank and easy-going charms, bright energy and flexible chemistry with other cast members".

[63] In February 2017, Hyeri was appointed as one of the ambassadors for the Count Every Child birth registration campaign as part of her NGO partnership with Plan Korea.

[64] In 2018, Hyeri participated in a Plan Korea fundraiser for children born without birth registration and wrote a letter to fans asking for potential donors.

[65] At 25 years old, Hyeri became the youngest member of UNICEF's Honors Club, having donated more than ₩100 million "to run educational programs for underprivileged children and AIDS-prevention campaigns in underdeveloped nations in Asia".

[70] In 2022, Hyeri donated ₩50 million to the Hope Bridge Disaster Relief Association to help the victims of the massive wildfire that started in Uljin, Gyeongbuk and has spread to Samcheok, Gangwon.

[73] The success of Reply 1988 combined with Hyeri's status as an icon of aegyo led to her becoming one of the most in-demand advertising models in South Korea.

[74][75][76] By the start of 2016, she had shot over 30 advertisements for brands such as Puma, Lotte Confectionery's Ghana, Bohae, Amore Pacific's Happy Bath, and was consequently given the title of "₩10 billion girl (ko: 100억 소녀)" by the South Korean media.

[77][78][79] Following her appointment as the model for Albamon (ko: 알바몬), a part-time job recruiting site, Hyeri was awarded with the plaque of appreciation by the Ministry of Employment and Labour for "promoting minimum wage awareness and compliance" in March 2015.

[80] In January 2017, Albamon received "Consumer Choice Best Brand Award" for "its efforts to improve the rights of the public by providing high quality part-time job announcements" after an ad featuring Hyeri and Im Chang-jung reached over 10 million views in just a month after its release.

[84] In July 2019, Hyeri unveiled her personal YouTube channel, where she began posting vlogs, mukbangs, and behind the scenes footage from filming sets.

[86] In March 2020, Hyeri criticised Nth room-related cybersex trafficking on her Instagram account and urged her followers to sign a petition to reveal the identities of the perpetrators, stating that she hopes that "they face harsher punishment for what they did".