{ "abstract": "This is the first part of a project concerning the regularity of the free boundary of a function, where the free boundary depends on the gradient of the function. We study the minimizer of the expression \\begin{equation*} J(u) : = \\int_{B_1} F(\\nabla u) \\ dx, \\end{equation*} where $F(x)$ is a uniformly convex function whose second derivatives might jump at $|x|=1$. This results in an Euler-Lagrange equation that varies over the free boundary, which we define as $$ Γ= \\partial \\{x \\in B_1: |\\nabla u| >1 \\} \\cap \\partial \\{x \\in B_1: |\\nabla u| <1 \\}. $$ We consider two-phase flat points for which the second derivatives of $F$ jump over $Γ$. In this paper, we show that under some regularity and non-degeneracy assumptions, a minimizer $u$ can be expressed as $$ u(x)= a + ν\\cdot x+ δp(x) + δεq(x), $$ where $a \\in \\mathbb{R}$, $ν\\in \\mathbb{R}^n$, $0 < δ, ε<< 1$. Here $p$ is a $C^1$ function, which consists of one polynomial in the upper half ball and another polynomial in the lower half ball. The function $q$ is a rest term with bounded $L^2$ norm. Furthermore, assuming that we have a sequence, $u^j$, of minimizers, we show that $q^j$ converges weakly to a function $q^0$ that satisfies a certain PDE. In addition, we show that $q^0$ is $C^3$ in $B_r^+$ and $B_r^-$, respectively, for $0