On the same day, Oh My Girl announced their official fandom name, "Miracle", at their comeback showcase for Pink Ocean and also on the group's V-app.

[15][16] On May 26, 2016, the group released the reissue of Pink Ocean, titled Windy Day with two new songs, "Windy Day" and "Stupid in Love", along with the Chinese version of "Liar Liar" (which was released in Pink Ocean exclusively on online streaming services in China).

[17][18][19] On August 1, they released a special summer single album containing four remake songs, including Papaya's "Listen to My Word (A-ing)" featuring Skull and Haha.

[22] On August 20 and 21, the group held their first solo concert titled "Summer Fairy Tales" at the Blue Square Samsung Card Hall in Seoul, South Korea.

[23] Tickets were available to purchase on July 22 and were sold out within three minutes, breaking the record for the fastest sold-out concert for a rookie group.

[24] On August 25, WM Entertainment released a statement announcing JinE's hiatus from the group's activities while she received treatment for anorexia nervosa.

JinE will not be taking part in upcoming album promotions and activities in favor of continued treatment and recovery.

During Oh My Girl's Comeback Showcase, it was revealed that the pink dolphin in the Coloring Book MV, was made in reference to JinE.

[28] On October 30, WM Entertainment confirmed that due to continued health issues, JinE's contract with the company had been terminated and that she had officially left the group.

[29] On December 23, 2017, WM Entertainment announced Oh My Girl's comeback on January 9, with their fifth EP Secret Garden.

[31][23] The six-day sold-out concert held beginning February 22 to 26 at the Shinsegae Mesa Hall in Seoul, South Korea.

[33][34] It was announced that the group would release a pop-up album titled Oh My Girl Banhana - Banana Allergy Monkey on April 2.

The title track "Banana Allergy Monkey" is sung by the group's sub-unit Oh My Girl Banhana, which consists of Hyojung, Yubin and Arin.

The Banhana sub-unit debuted in August 2018 with a Japanese version of the Banana Allergy Monkey EP.

[39] Oh My Girl started the year with their first Japan Debut Commemoration Live Tour, on January 4–6, 2019 in Fukuoka, Osaka and Tokyo.

Subsequently, the group released a teaser announcing that their return will be with their seventh EP Nonstop with a game-themed concept.

[67] Both the single and B-side track "Dolphin" became the group's highest-charting releases at the time, peaking at second and ninth on the weekly Gaon Digital Chart, respectively.

[88] On May 9, Jiho left the group after decided to not renew her contract with WM and Oh My Girl would reorganize as six members.

The appointment ceremony was held at the Girl Scouts Korea Federation Hall in Anguk-dong, Seoul.