It's likely not a true story. Most often, such titles are part of fictional literature where the plot and characters are created by the author's imagination rather than real-life occurrences.
In visual novels, 'be' is short for bad ending which is an important aspect. It gives a different flavor to the overall narrative experience. A 'be' can shock the player, make them sad or disappointed, but also makes the story more memorable. Regarding 'ne', I'm not really sure. It could be a unique term in some indie visual novels or a local jargon within a specific community of visual novel enthusiasts. It might also be a typing error where someone meant to type something else like 'new' or 'net' in relation to the visual novel's online or updated content.
One characteristic is the exploration of different musical styles. Since both BTS and 2NE1 have distinct musical identities, fanfics often blend their styles in creative ways. For example, a fanfic might describe a new song that combines BTS's rap - heavy tracks with 2NE1's edgy pop sound.
Another theme is collaboration. Many fanfictions imagine the two groups creating amazing music together. It could be a new type of genre - blending the edginess of 2ne1 with the swag of Bigbang. For example, they might come up with a super - hit song that tops all the charts. Also, there are fanfictions that focus on the cultural impact of such a collaboration, how it could influence the global K - pop scene.
Love stories are also common. There could be romantic relationships between members of the two groups or between an idol and a non - idol character in the fanfiction world. These love stories often play out against the backdrop of the K - pop industry, with all its glamour and challenges.
One common theme is friendship. Since both groups are iconic in K - pop, fanfictions often explore the idea of the members becoming friends, sharing their experiences, and supporting each other in the competitive music industry.