
In the 4th season there were a few major changes:
1) X-Factor
The big twist for the year was The X-Factor. Eight houseguests were introduced, only to have five houseguests' exes compete against them in the game. This quickly became messy, as Scott, a houseguest who had his ex-girlfriend move into the house, had a violent outburst, and subsequently told the house that he had had a sexually transmitted disease. He was disqualified and evicted from the game.
2) Golden Power of Veto
Another twist, introduced in the last veto contest of Big Brother 3, was the Golden Power of Veto, in that if a nominated person won such a veto, they would be allowed to take themselves off consideration for voting, which was not allowed when the veto was introduced originally the year before.
3) Jury
One last twist to the format included a jury of seven who would decide the outcome of the game. When the game got down to nine players, the evictees formed the jury. The jury format eliminated America's need to break a tie if necessary, as done before in Season 3 (though Lisa won 9-1).

Jun was one of thirteen (twelve after a disqualification) contestants who were confined in a house together, with the objective of outlasting others, with fellow contestants voting out one member each week. Jun lasted until the end of the show, day 82, with Alison Irwin as the only other person in the house. A jury of seven evicted contestants voted for who they wished to win. Six voted for Jun, while only one voted for Alison. Jun was awarded $500,000 as the grand prize of the show.